A hollowjack hatchling is a mischievous creature prone to trickery; they especially seem to enjoy scaring those who stay a little too late when picking pumpkins. As hatchlings they're headless, the stump of their neck constantly bleeding, but this doesn't seem to hinder them much as they move around their patch at night. During the day a hatchling will sleep beneath the vines and is relatively harmless even if a magi happens to stumble across one. Trying to take it home, however, has been said to result in the hatchling reappearing in its patch and the foolish magi losing their own head.

The hollowjack spends most of its life in the pumpkin patch where it hatches, waiting quietly in the shadows and beneath the vines. On dark moonless nights, especially towards the end of the year, it emerges from its patch to hunt anyone unlucky enough to be nearby. Fast and agile, its eyes burning with green flame, it will run down those in its territory and carry them away into the night, never to be seen again. Fortunately the hollowjack has one weakness: it cannot cross bridges. If any magi finds themselves being chased by a hollowjack, they know that if they can reach a bridge - and get across it - they will be safe, if unable to ever return to that area for fear that the hollowjack will remember their scent.